Manufacture of insulating tubes



Jan. 1925- 1,522,679

' E. HAEFELY MANUFACTURE OF INSULATING TUBES Filed March 8, 1923 H b Fig. i. a e

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ENITE fiTATEfi tantra EMIL HAEFELY, OF BASEL, SVTITZERLAND.

MANUFACTURE OF INSULATING TUBES.

Application filed March 8,

To all whom it may concern:

Be it known that I, EMIL HAEFELY, a citizen of the Swiss Republic, and resident of Basel, Switzerland, have invented new and useful Improvements Relating to the Manufacture of Insulating Tubes, of which the following is a full, clear, and exact specification.

This invention relates to themanufacture of insulating tubes by coiling or winding a strip or band of paper or the like coated with an agglutinant, the tube thus formed being consolidated by the application of heat during the coiling operation.

Machines for this purpose usually comprise a rotating drum or mandrel upon which the band or strip is wound, pressure being applied to the layers during the rotation of the drum by means of a heated pressure angle piece extending throughout the full length of the drum.

According to the present invention the pressure angle piece is subdivided trans versely into a number of freely movable an gular sections arranged side by side with one another along the length of the drum, each section comprising pressure shoes arranged to be heated. By this arrangement the heating and pressing device can be readily adapted for any desired length of tube to be manufactured by adding or removing one or more pressure sections.

The invention is illustrated in the accompanying drawings as embodied in a constructional form thereof.

Figure 1 being a view in vertical section and Figure 2 a front view of the machine.

Figures 3 and 4 illustrate a preferred form of pressure shoe suspension.

Referring now to the drawings the angular pressure sections which together constitute the pressure device are indicated in Figures 1 and 2 at a and are suspended parallel to one another on a carrier 1) which can be raised and lowered the suspension of the angle sections a on the carrier 7) being effected by means allowing the same to freely move on said carrier within certain limits in a vertical direction as well as in transverse planes so as to allow of independent rocking adjustment of said angle sections according to differences in thickness of the work piece. The pressure sections a are arranged above a slowly rotating drum 0 on which a web of insulating material provided 1923 Serial No. 623,813.

with an agglutinant is rolled into a tube under the pressure of the sections a.

Each of these sections a carries two heated pressure shoes (Z one on each limb. These pressure shoes are adapted to be inserted in longitudinal slots 6 in the limb of the pressure device, so that they can be adjusted in accordance withthe diameter of the insulating tube. Each pressure shoe cl itself consists of two main parts as shown in Figures 3 and a, the upper part al being guided along the limb of the device and adjusted by means of a wedge screw, and the lower art (Z being suspended from the upper part 03 by Z-shaped brackets. The lower part 03 is electrically heated, and pressure is transmitted thereto from the upper part 03 by means of a knife edge (i so that the lower part 05 can adjust itself within certain limits by tilting about the knife edge (i In this manner accurately flat contact of the pressure shoe with the insulating tube to be constructed is obtained. Instead of supporting the lower part d by means of a knife edge, this part could be supported by means of a ball and socket connection or other form of universal joint.

The pressure shoes d of each row are provided on their under surfaces with a thin metal sheet 9 which extends in a single piece over the entire length of the insulating tube, and has for its object to cover or bridge the joints between the pressure shoes and at the same time to produce a uniform transference of heat from the pressure shoes on to the part to be treated. The sheet 9 is preferably suspended from the pressure shoes cl by means of loops.

The limbs of the pressure device may be at any desired angle with one another, and may also be so arranged that each set of pressure shoes can, as regards the pressure exerted, be arranged to be independent of one another.

What I claim is l. A machine for the manufacture of insulating tubes by means of a web of insulating material coated with an agglutinant, comprising a revolving drum adapted to have the insulating material wound thereon and a row of freely movable narrow closely adjacent angle sections provided on their limbs with separate heated pressure shoes and arranged to exert pressure on the successive layers of insulating material during rotation of the drum.

2. A machine for the manufacture of insulating tubes by means of a web of insulating material coated with an agglutinant, comprising a revolving drum adapted to have the insulating material wound thereon and a row of narrow closely adjacent angle sections provided on their limbs with sepa rate heated pressure shoes and arranged to exert pressure on the successive layers of insulating material during rotation of the drum each of said pressure shoes consisting of an upper and lower part which are so movably connected that the lower part can adjust itself by tilting relative to the upper art. 3 t p 3. A machine for the manufacture of insulating tubes by means of a web of insulating material coated with an agglutinant, comprising a revolving drum adapted to have the insulating material Wound thereon and a row of narrow closely adjacent angle sections provided on'their limbs with separate heated pressure shoes and arranged to exert pressure on the successive layers ofinsul'ating material during rotation of the drum, the pressure shoes of each row being furnished with a thin metal sheet to bridge the joints between them.

In witness whereof I have hereunto signed my name this 16th day of February 1923, in the presence of two subscribing witnesses.

EMIL HAEFELY. Witnesses:

AMAND ZEAM, C. W. MILLER. 

